forked from OSchip/llvm-project
114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
//===- InputSection.cpp ---------------------------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "InputSection.h"
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#include "Config.h"
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#include "Error.h"
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#include "InputFiles.h"
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#include "OutputSections.h"
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#include "Target.h"
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using namespace llvm;
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using namespace llvm::ELF;
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using namespace llvm::object;
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using namespace lld;
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using namespace lld::elf2;
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template <class ELFT>
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InputSection<ELFT>::InputSection(ObjectFile<ELFT> *F, const Elf_Shdr *Header)
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: File(F), Header(Header) {}
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template <class ELFT>
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template <bool isRela>
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void InputSection<ELFT>::relocate(
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uint8_t *Buf, iterator_range<const Elf_Rel_Impl<ELFT, isRela> *> Rels,
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const ObjectFile<ELFT> &File, uintX_t BaseAddr,
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const OutputSection<ELFT> &BssSec, const PltSection<ELFT> &PltSec,
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const GotSection<ELFT> &GotSec) {
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typedef Elf_Rel_Impl<ELFT, isRela> RelType;
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bool IsMips64EL = File.getObj().isMips64EL();
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for (const RelType &RI : Rels) {
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uint32_t SymIndex = RI.getSymbol(IsMips64EL);
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uint32_t Type = RI.getType(IsMips64EL);
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uintX_t GotVA = GotSec.getVA();
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uintX_t SymVA;
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// Handle relocations for local symbols -- they never get
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// resolved so we don't allocate a SymbolBody.
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const Elf_Shdr *SymTab = File.getSymbolTable();
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if (SymIndex < SymTab->sh_info) {
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const Elf_Sym *Sym = File.getObj().getRelocationSymbol(&RI, SymTab);
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if (!Sym)
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continue;
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SymVA = getLocalSymVA(Sym, File);
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} else {
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const auto &Body =
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*cast<ELFSymbolBody<ELFT>>(File.getSymbolBody(SymIndex));
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SymVA = getSymVA<ELFT>(Body, BssSec);
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if (Target->relocNeedsPlt(Type, Body)) {
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SymVA = PltSec.getEntryAddr(Body);
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Type = Target->getPCRelReloc();
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} else if (Target->relocNeedsGot(Type, Body)) {
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SymVA = GotSec.getEntryAddr(Body);
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Type = Target->getGotRefReloc();
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} else if (Target->relocPointsToGot(Type)) {
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SymVA = GotVA;
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Type = Target->getPCRelReloc();
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} else if (isa<SharedSymbol<ELFT>>(Body)) {
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continue;
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}
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}
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Target->relocateOne(Buf, reinterpret_cast<const void *>(&RI), Type,
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BaseAddr, SymVA, GotVA);
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}
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}
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template <class ELFT>
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void InputSection<ELFT>::writeTo(uint8_t *Buf,
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const OutputSection<ELFT> &BssSec,
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const PltSection<ELFT> &PltSec,
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const GotSection<ELFT> &GotSec) {
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if (Header->sh_type == SHT_NOBITS)
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return;
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// Copy section contents from source object file to output file.
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ArrayRef<uint8_t> Data = *File->getObj().getSectionContents(Header);
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memcpy(Buf + OutputSectionOff, Data.data(), Data.size());
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ObjectFile<ELFT> *File = getFile();
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ELFFile<ELFT> &EObj = File->getObj();
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uint8_t *Base = Buf + getOutputSectionOff();
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uintX_t BaseAddr = Out->getVA() + getOutputSectionOff();
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// Iterate over all relocation sections that apply to this section.
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for (const Elf_Shdr *RelSec : RelocSections) {
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if (RelSec->sh_type == SHT_RELA)
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relocate(Base, EObj.relas(RelSec), *File, BaseAddr, BssSec, PltSec,
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GotSec);
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else
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relocate(Base, EObj.rels(RelSec), *File, BaseAddr, BssSec, PltSec,
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GotSec);
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}
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}
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template <class ELFT> StringRef InputSection<ELFT>::getSectionName() const {
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ErrorOr<StringRef> Name = File->getObj().getSectionName(Header);
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error(Name);
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return *Name;
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}
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namespace lld {
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namespace elf2 {
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template class InputSection<object::ELF32LE>;
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template class InputSection<object::ELF32BE>;
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template class InputSection<object::ELF64LE>;
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template class InputSection<object::ELF64BE>;
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}
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}
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